<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>函数防抖</title>
</head>
<body>
  <input type="text">
  <script>
    const input = document.querySelector('input')
    input.oninput = debounce(() => {
      console.log(Date.now())
    }, 1000)
    function debounce(callback, time) {
      let timer
      return function() {
        if(timer) clearTimeout(timer)
        timer = setTimeout(() => {
          callback()
        }, time)
      }
    }
  </script>
</body>
</html>